Human beings是复数形式，指代多个人或人类整体。 human being是单数形式，指代单个人或作为个体的人类。 语法上beings强调群体概念，being强调个体概念。 A man, woman, or child of the species homo sapiens (智人), distinguished from. Ergonomics (or human factors) is the scientific discipline concerned with the understanding of interactions among humans and other elements of a system, and the profession that applies.
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知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区.
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